Closure cap



July 28, 1931. A. c. sPAHN 1,816,499

GLosURE CAP Filed Feb. 1o. 1928 atentecl july' 28, 193i UNITED STAT .Para a prior AUGUST C. SPAHN, 0F EVANSVIIJLE, INDIANA, .ASSIGNQR TO BERNARDIN BOTTLE CP f COMPANY, OF EVANSVILLE, INDIANA., A CORPORATION OF INDIANA crostini: oar

Application filed February 10, 1928, Serial No. 253,30*?.l

The invention relates to closure caps of the type which are adapted to grip frictionally the upper or top portion of a rigid container having a substantially straight cylindrical side wall.

The object of the invention is to provide an improved cap of this type which will be securely held by friction against the side wall of the container and will still be effective after removal and upon replacement to grip frictionally the container.

The invention consists in the several novel features hereinafter set forth and more particularly defined by the claims at the conclusion hereof.

In the drawing: Fig. l is a vertical section of a cap embodying the invention. Fig. 2 is a side elevation. Fig. 3 is a plan, a portion being broken away.

The invention is exemplified in a cap which is formed of slightly resilient sheet metal, and comprises a top wall l and a depending integral annular skirt 5. The skirt is formed with a series of annular corrugations 6 having inner and outer reversely curved crowns. There are sufficient of these corrugations to form a plurality (preferably three) of inner crowns to form substantially continuous annular frictional container-gripping surfaces 7 which are spaced apart vertically, so that the straight wall portion 8a of a container 8 will be frictionally gripped on lines or Zones spaced apart vertically. v rlhe lower margin of the skirt extends outwardly from vthe lowermost gripping surface 7 as at 9, and its lower edge is doubled upon itself, as at 10, to form a reinforced or stiffened lower edge. A disk 1l of parafHn paper or other suitable material is interposed between the upper margin of the rim of the container and the top 4 of the cap, as well understood in the art.

The gripping surfaces 7 are vertically aligned, so that normally they all frictionally grip the container with substantially the same force. By providing a plurality of I. these gripping surfaces, the gripping force will be cumulated according to the number 'from the container.

Vlower edge.

`ofsuch surfaces, Aso that the cap will be securely held on the container.`

In practice7 when it is desired to remove the cap, it is customary to strike the lower edge 9 ofthe cap toproduce a peeningeffect on the metal forming the gripping surfaces which Vwill cause suoli surfaces to relax sufficiently topermit the cap to `be removed surfaces may be provided without a skirt of unwieldy height. y

TheY invention exemplifies a closure cap 0of vthe frictionally gripping type for straight cylindrical containers in which thefrictional gripping of a plurality of annular surfaces against the straight side of the containeryis cumulated to retain securely the cap on the container; also a cap of this type which ,may be caused to release its grip upon'the clontainer by tapping the lower portion thereof,

and leaving the'metal formingrthe upper gripping surface substantially effective for gripping, so that the'cap may be replaced with sufficient gripping force to effectively retain it on thecontainer. v

The invention-is `not to be understood `as restricted to the details set forth, since these jmay bevrnodified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described thelinvention, what- I claim as new and desire to secure by .Let-

ters Patent, is:

This striking of the l. A closure cap for a containerhavinga substantially straight`v cylindrical side-wall adjacent to its upper end, said cap com-v prising a top and a depending integral skirt of resilient metal, the skirt having annular corrugations with inner Crowns rounded and forming a plurality of substantially continuous annular frictional container-gripping surfaces which are spaced apart vertically, the skirt extending outwardly from the lowermost gripping surface so its lower edge will be spaced from the container wall and form a portion which may be tapped in order to effect a peening of the contiguous metal for cap removal purposes, the annular corrugations of the skirt being of such number and character that the inner crown parts remote from the outwardly extending part of the skirt are subjected, during tapping, to a less peening effect than the lower crown parts and consequently retain sufficient resiliency to grip frictionally and securely the container upon replacement of the cap on the container.

2. A closure cap for a container having a substantially straight cylindrical side-wall adjacent to its upper end, said cap comprising a top and a depending integral skirt of resilient metal, the skirt having annular corrugations with inner crowns rounded and forming a plurality of substantially continuous annular friction container-gripping surfaces which are spaced apart vertically, the skirt having its lower margin stiifened and flared outwardly from the lowest gripping surface to form a portion that is spaced from the container and is adapted to be tapped in order to effect a peening of the contiguous metal for cap removal purposes, the annular corrugations of the skirt being of such number and character that the inner crown parts remote from the outwardly flared lower margin of the skirt are subjected, during tapping, to a less peening effect than the lower crown parts and consequently retain suflicient resiliency to grip friction'ally and securely the container upon replacement of the cap on the container.

3. A closure cap for a container having a substantially straight cylindrical side wall adjacent to its'upper end, said cap comprising a top and a depending integral skirt of resilient metal, the skirt having annular corrugations the Vouter and inner crowns of which are rounded and of similar conformation, the inner crowns forming three substantially continuous annular frictional container-gripping surfaces which are spaced apart vertically and are adapted to grip directly and frictionally the side wall of the container, the skirt extending outwardly from the lowermost gripping surface so its lower edge will be spaced from the outer periphery of the container side wall.

Signed at Evansville, Indiana, this 30 day of January, 1928.

Y AUGUST C. SPAHN. 

